Quick opening rotary valve



Nov. 19, 1946. c. w. HALL QUICK OPENING ROTARY VALVE Filed April 30,1945 G77/:fuis h4 HALL. BY E ATTORNEY. f

Patented Nov. 19, 1946 QUICK OPENING ROTARY VALVE Charles W. Hall,Denver, 010., assigner to Malcolm S. Losey, Denver, Colo.

Application April 3l), 1945, Serial No. 591,089

(Cl. 12B-190) 4 Claims.

This invention relates to an improvement in rotary valves for internalcombusti-on engines.

The principal object of this invention is to provide means incombination with a rotary valve whereby the opening and closing of thevalve ports will be accelerated.

Another object of the invention is to provide an improved. means formounting the valve whereby friction the walls will be reduced and anaccurate oil-floated bearing will be provided.

Other objects and advantages reside in the detail construction of theinvention, which is designed for simplicity, economy and eiiiciency.These will become more apparent from the folw lowing description.

In the following detailed description of the invention, reference is hadto `the accompanying drawing which forms a part hereof. Like numeralsrefer to like parts in all views of the draw ing and throughout thedescription.

In the drawing:

Fig. l is a cross section through the head of a typical internalcombustion engine cylinder illustrating the improved valve in placetherein;

Fig. 2 is a horizontal section, taken on the line 2 2, Fig. 1;

Fig. 3 is a similar section, taken on 3 3, Fig. 1; and

Fig. 4 is a diagrammatic View illustrating the action of the quickopening feature of the invention.

In the drawing, a portion oi an internal combustion engine cylinder isindicated at I with its cylinder head at I I. The cylinder may besurrounded by the usual cooling water jacket space I2. A cup-shapedvalve seat I3 is formed over the cylinder head l l to receive acylindrical rotary valve le. Suitable sealing rings 25 seal the valve I4to its seat i3. The valve is provided with an intake passage I5communicating between a liat bottom surface on the valve I4 and anintake port I3 in the cylindrical wall of the seat I3. lt is alsoprovided with a suitable exhaust passage I'I communicating at intervalsthrough the bottom of the valve I4 and with an exhaust port I8 in thecylindrical wall of the valve seat I3.

The passages I5 and l? communicate through the bottom of the valve ILIat 90 from each other and at equal radial distances from the axis of thevalve so as to alternately align with a cylinder port I9 opening throughthe cylinder head Il. Thus, when the valve is in the position of Fig. l,the cylinder l0 is in communication through the exhaust passage I'I withthe exhaust port I8. If the valve I4 is rotated 90 from the aboveposithe line tion, it will bring the intake passage I5 into alignmentbetween the cylinder port I9 and the intake port I3 to allow fuel toenter the Cylinder.

The valve seat I3 is closed by means of a head member 20 Isecured Itothe engine by means of suitable cap screws 2l. The head member 2Q is inturn closed by means of a cap plate 22 held in place thereon by means ofcap screws23.

A conical guide boss 24 is formed on and supported from the head member2li and extends into a conical seat in the head of the valve I4 tomaintain the latter in alignment with its axis and out of frictionalengagement with the walls of the valve seat. The valve is rotated bymeans of a hub sleeve 2S which extends,upwardlytherefrom through theguide boss 2c terminating in any suitable drive mechanism. Asillustrated, the sleeve 23 carries a driven gear 2i' which is drivenfrom a drive gear 23 mounted on a valve drive shaft 29.

The quick opening feature of the valve results from the action of anoscillating plate lil placed between the valve lll and the cylinder headEl. This plate is provided with an opening positioned to normally alignwith the cylinder port I3 and provided with an axially expansiblesealing ring 3l having a ring opening 32. The plate 30 is mounted on theextremity of a plate shaft 33 extending upwardly through the valve I4and its sleeve 26 and terminating in an actuating lever 34. Theactuating lever 34 is secured to the shaft 33 in any'desired manner toprevent re1a tive movement therebetween, such as being mounted on asquare extremity thereof by means of an attachment screw 35.

The free extremity of the lever 34 carries a cam follower pin 33 whichrides in a cam groove 3`I formed in a cam member 43. The cam member 4Bis mounted on the drive shaft 29. The cam groove is provided with a highpoint, at one side of its periphery so thatl the pin 361 will act toreciprocate the lever 34 forwardly and backwardly once during eachrevolution of the drive gear 28 and twice during each revolution of thedriven gear 2l and the valve I4. The reciprocation is so timed that whenthe exhaust passage I1 begins to travel over the cylinder port I9, asindicated by the arrow A in Fig. 4, the plate 33 will be rapidly rotatedin a direction opposite to the rotation of the valve for a shortdistance, as indicated by the arrow B Fig; 4, so as to :instantlyincrease the area of the initial opening. It will then move in thedirection of the rotation of the valve back to its original position inalignment with the cylinder port I9. This serves to provide an instant,relatively-wide, opening between additional high point in the cam grooveat the proper point.

A compression spring 39 constantly urges the lever 34 upwardly to causethe plate 30 to be pressed lto a sealing fit against the bottom of thevalve. The sealing ring 3l is of a multiple type which expandsvertically to seal the ring opening`32 lboth to the bottom of the valveand to the head of the cylinder.

The valve is hydraulically urged downwardly by means of lubricating oilunder pressure between the conical guide member 24 and the conical seat44. This oil may be admitted through the cap 22 through a feed nipple38; then-ce flowing under pressure, through an axial oil passage 4I inthe shaft 33, to outlets 42 at the bottom of the conical seat 44. Itthence urges the members 24 and 44 apar-t as it flows upwardly to arestricted discharge 43. The oil passage 4i may be continued into theplate 30 as indicated at 44 to provide lubrication under pressure to theboty tom of the valve I4 and plate 30.

While a specic form of the improvement has been described andillustrated herein, it is desired to be understood that the same may bevaried, within the scope of the appended claims,

opening between the passage and the por-t comprising an oscillatingmember positioned therebetween, said oscillating member having anopening communicating between said passage and said port and means foroscillating said member to :cause the latter opening to move over andopen said passage more rapidly than the movement of said passage oversaid port.

2. The combination with a rotary valve having a gas passage whichperiodically aligns with a cylinder port, means for creating a morerapid opening between the passage and lthe port comprising: a discpositioned between said passage and said port, .there being an openingin said disc communicating between said passage and said port; and meansfor oscillating said disc to move said opening to open said port to saidpassage as the latter approaches axial alignment with said port. V

3. The combination with a rotary valve having a gas passage whichperiodically aligns with a cylinder port, means for creating amore'rapid opening between the passage and the port comprising: a discpositioned between said passage and said port, lthere being an openingin said disc communicating between said passage and said port; a shaftcarrying said disc; an actuating arm extending from said shaft; and aneccentric member positioned to swing said actuating arm so as to causesaid opening to open said passage in advance of Ithe alignment of saidpassage with said port. Y v

4. In a rotary valve of the type adapted to be positioned between anengine cylinder and its head .and having passages which periodicallycommunicate between a cylinder port and exhaust and intake por-ts, meansfor mounting said i Valvecomprising; an inverted conical bearing memberextending from said head into a conical, axially positioned bearingcavity in said valve and providing a bearing therefor; and means forurging said valve with cavity upon said bearing member.

CHARLES W. HALL.

